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Waves and Sound
© 2010 Pearson Education, Inc.
Slide 15-2
Figure 15.3
© 2010 Pearson Education, Inc.
Capillary waves in water
Surface tension (not gravity)
© 2010 Pearson Education, Inc.
© 2010 Pearson Education, Inc.
Slide 15-3
© 2010 Pearson Education, Inc.
Slide 15-4
Types of Waves
A transverse wave
A longitudinal wave
© 2010 Pearson Education, Inc.
Slide 15-12
© 2010 Pearson Education, Inc.
Sinusoidal Waves
© 2010 Pearson Education, Inc.
Sound and Light Waves
The speed of sound varies
with the medium.
Light and other
electromagnetic waves
in vacuum and in air
move at the same speed,
3.00 x 108 m/s.
(Light speed varies with
medium too.)
© 2010 Pearson Education, Inc.
Slide 15-32
The Decibel Scale
Sound intensity level is measured in
decibels.
Sound intensity is calculated from
the base 10 logarithm of the ratio of
the sound intensity in watts/m2 to
the intensity at the threshold of
hearing, 1/trillionth of a watt/m2
© 2010 Pearson Education, Inc.
Slide 15-36
© 2010 Pearson Education, Inc.
The wave “envelope” is a description of the shape of a
pattern that is superimposed on a wave
This consistent wave envelope makes an “A” sound like
an A, as opposed to an “E”
© 2010 Pearson Education, Inc.
© 2010 Pearson Education, Inc.
© 2010 Pearson Education, Inc.
© 2010 Pearson Education, Inc.
Analog to Digital and Digital to Analog Conversion
A/D and D/A
© 2010 Pearson Education, Inc.
Analog to Digital and Digital to Analog Conversion
A/D and D/A
© 2010 Pearson Education, Inc.
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